I'm planning an organic pool. Although I was inspired by David Pagan Butler's ideas, I will not be following his typical build. I am approaching it something more like a conventional pool, although I will be incorporating the airlift means of circulating the water. My plans include a singular, large vertical pipe with which to move a column of water which will then be divided into two pipe sections that will carry the water in two different directions down into the filtration beds. As I imagine it, the beds will consist of larger stones on the bottom and will be covered with stones increasingly smaller in size until the last few inches or so that will consist of pea gravel. So in this pool, the water will rise from the bottom of the filtration bed, up through the stones and gravel until it reaches the surface. I have read that some natural pools that filter from the top down have developed a problem with the beds getting clogged up with debris. It is my hope that the bottom up approach might prevent this. Now, to the point of this post. Is it possible that certain organisms could be employed to assist in keeping the gaps between the stones and gravel clear?
If so, what kind of organisms/species?
I'm thinking of some kind of freshwater shrimp, but IDK. I live in zone 6B and Winter can be somewhat hostile here.